[Libav-user] Preserve aspect ration while using sws_scale() API

gga ggarra13 at gmail.com
Mon Aug 3 20:03:40 EEST 2020

On 3/8/20 03:47, rohit khali wrote:
> Hi,
> I am using sws_scale() API to scale my decoded YUV(any format) to 
> YUV420P with 'new' width and height.
> Instead of hardcoding destination width and height, I want to preserve 
> the original aspect ratio. My idea was to provide destination height 
> and let API decide on width using aspect ratio.
> Is there a way to achieve this?
> Thanks in advance for the help!

There's nothing in the ffmpeg api to do it, but you can do it yourself 

double aratio = (double) width / height;
size_t newwidth = aratio * newheight;

Or is there something else I am missing?


Gonzalo Garramuño

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